The lawsuit, which was filed in Manhattan federal court this week, alleges that Chase charged those customers extra fees and higher interest rates on the cash advances than on credit card transactions. Additionally, the bank denied reimbursement of the charges when customers complained.

While Chase, the largest bank in the U.S., has declined to comment on the lawsuit, the bank’s spokeswoman told Reuters.com that Chase stopped processing credit card purchases of cryptocurrency on Feb. 3 due to the risk involved. She added that Chase customers can use their debit card to purchase the digital currency from their checking accounts without having to incur the cash advance charges.

The case, Brady Tucker et at v Chase Bank USA, states that the plaintiff, Idaho resident Brady Tucker, was charged $143.30 in fees and $20.61 in interest charges for five cryptocurrency transaction he made between late January and early February. Tucker adds that hundreds or possibly thousands of additional Chase customers were hit with similar charges.

“Chase provided no prior notice to its cardholders that their crypto ‘purchases’ would be treated as ‘cash advances’ on a going-forward basis,” Tucker said in the lawsuit.

Additionally, because Chase didn’t give its customers fair-warning of the changes, the lawsuit accuses that bank of violating the U.S. Truth in Lending Act, which requires credit card issuer to be notified in writing of any changes in charges or terms.

This isn’t the first time Chase makes news in the cryptocurrency community. In September 2017, Chase CEO Jamie Dimon called bitcoin a “fraud” and added that he’d fire any JPMorgan trader who was caught trading bitcoin because “it’s against our rules and they are stupid.”

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